Leaving the European Union without a deal is Britain’s best bet for future success and would lead to a £140billion Brexit boom, according to economists.

MPs will be given a vote on ruling out quitting the bloc unless an agreement is in place if Theresa May’s exit plan is rejected on Tuesday. But the pro-Leave Economists for Free Trade group has made a last push to keep the option on the table and accused Remainers of “Project Fear” hysteria about walking away. Its analysis found Britain will flourish if it leaves on March 29 on world trade rules.